2009-10-22 22:04:04 -

Great Lakes Dredge & Dock Corporation (NASDAQ: GLDD) today announced that it will release its financial results for the quarter and nine months ended September 30, 2009 on Tuesday, November 3, 2009 at 7:00 a.m. C.S.T. A conference call with the Company will be held the same day at 10:00 a.m. C.S.T. The call in number is 866-202-1971 and passcode

is 40845286. The call can also be heard on the Company’s website, www.gldd.com : under Events and Presentations on the investor relations page.
Information related to the conference call will also be available on the investor relations page of the Company’s website. The conference call will be available by replay for two weeks, by calling 888-286-8010 and providing passcode 79108006.

Great Lakes Dredge & Dock Corporation is the largest provider of dredging services in the United States and the only U.S. dredging company with significant international operations, averaging 30% of the Company’s total dredging revenue over the last three years. Great Lakes is a leader in each of the U.S. markets in which it competes: capital, maintenance and beach nourishment dredging. The Company is also one of the largest U.S. providers of commercial and industrial demolition services. Additionally, the Company owns a 50% interest in a marine sand mining operation in New Jersey which supplies sand and aggregate used for road and building construction. Great Lakes has a 119-year history of never failing to complete a marine project and owns the largest and most diverse fleet in the industry, comprised of over 180 specialized vessels.



Great Lakes Dredge & Dock CorporationDeborah A.

Wensel, Chief Financial Officer630-574-3772